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whnever i am clciking the next button for next qt to come,countdown strts from begining instead of coninuing from the prvios page. here is my code for aspx file
%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default4.aspx.cs" Inherits="Default4" EnableSessionState="True" %>

code for aspx.cs file
using System;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
using System.Collections;
//using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Web.SessionState;
using System.Net;

So, you have pasted all that code, crying for help and failed to copy the code that actually matters (the countdown script).
Also, where are you displaying the time? Label1? lblTime? Neither seem to be getting updated.

I could hazard a good guess purely based on the problem description. You are not persisting your "time remaining" to the correct place, its being reset on each page load.